Facing the increasingly serious global climate change problem, it is generally recognized that developing a circular economy is an important way to solve the problems of resource and environmental constraints and climate change. Green hydrogen, as a "carbon neutral hydrogen", mainly comes from processes such as hydrogen production from biomass, electrolytic water splitting, and photocatalytic water splitting. Its application forms include hydrogen fuel cells, hydrogen internal combustion engines, and industrial hydrogen, among which hydrogen fuel cells are the most promising hydrogen energy utilization technology. This paper reviews the working principles, advantages and disadvantages of various green hydrogen production technologies, compares the performance differences and application fields of different hydrogen fuel cells, and summarizes the advantages, bottlenecks and future development directions of current hydrogen production and utilization technologies. In the future, green hydrogen technology can focus on: developing efficient catalysts and fermentation processes for biological hydrogen production; breaking through material limitations, reducing costs and increasing efficiency in electrolytic water splitting/photocatalytic water splitting/hydrogen fuel cells; and solving transportation bottlenecks through the coupling of green hydrogen and green ammonia storage and transportation to promote large-scale applications in multiple scenarios.